A technician pushes horizontally at the edge of a circular turntable. The force is directed exactly towards the turntable's central pivot. Why does the turntable not start to rotate?
The force is applied at the edge, so it is balanced by the turntable's weight.
The perpendicular distance from the pivot to the force's line of action is zero.
The force produces equal clockwise and anticlockwise moments about the pivot.
The force is horizontal, so it cannot produce a turning effect.
124 exam-style questions on AQA GCSE Physics 5.4 Moments, levers and gears, covering 5.4 Moments, levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.